1 /* 2 * linux/arch/parisc/mm/init.c 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Copyright 1999 SuSE GmbH 6 * changed by Philipp Rumpf 7 * Copyright 1999 Philipp Rumpf (prumpf@tux.org) 8 * Copyright 2004 Randolph Chung (tausq@debian.org) 9 * Copyright 2006 Helge Deller (deller@gmx.de) 10 * 11 */ 12 13 14 #include <linux/module.h> 15 #include <linux/mm.h> 16 #include <linux/bootmem.h> 17 #include <linux/delay.h> 18 #include <linux/init.h> 19 #include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ 20 #include <linux/initrd.h> 21 #include <linux/swap.h> 22 #include <linux/unistd.h> 23 #include <linux/nodemask.h> /* for node_online_map */ 24 #include <linux/pagemap.h> /* for release_pages and page_cache_release */ 25 26 #include <asm/pgalloc.h> 27 #include <asm/tlb.h> 28 #include <asm/pdc_chassis.h> 29 #include <asm/mmzone.h> 30 #include <asm/sections.h> 31 32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 33 34 extern char _text; /* start of kernel code, defined by linker */ 35 extern int data_start; 36 extern char _end; /* end of BSS, defined by linker */ 37 extern char __init_begin, __init_end; 38 39 #ifdef CONFIG_DISCONTIGMEM 40 struct node_map_data node_data[MAX_NUMNODES] __read_mostly; 41 bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly; 42 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; 43 #endif 44 45 static struct resource data_resource = { 46 .name = "Kernel data", 47 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 48 }; 49 50 static struct resource code_resource = { 51 .name = "Kernel code", 52 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 53 }; 54 55 static struct resource pdcdata_resource = { 56 .name = "PDC data (Page Zero)", 57 .start = 0, 58 .end = 0x9ff, 59 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 60 }; 61 62 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; 63 64 /* The following array is initialized from the firmware specific 65 * information retrieved in kernel/inventory.c. 66 */ 67 68 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; 69 int npmem_ranges __read_mostly; 70 71 #ifdef __LP64__ 72 #define MAX_MEM (~0UL) 73 #else /* !__LP64__ */ 74 #define MAX_MEM (3584U*1024U*1024U) 75 #endif /* !__LP64__ */ 76 77 static unsigned long mem_limit __read_mostly = MAX_MEM; 78 79 static void __init mem_limit_func(void) 80 { 81 char *cp, *end; 82 unsigned long limit; 83 extern char saved_command_line[]; 84 85 /* We need this before __setup() functions are called */ 86 87 limit = MAX_MEM; 88 for (cp = saved_command_line; *cp; ) { 89 if (memcmp(cp, "mem=", 4) == 0) { 90 cp += 4; 91 limit = memparse(cp, &end); 92 if (end != cp) 93 break; 94 cp = end; 95 } else { 96 while (*cp != ' ' && *cp) 97 ++cp; 98 while (*cp == ' ') 99 ++cp; 100 } 101 } 102 103 if (limit < mem_limit) 104 mem_limit = limit; 105 } 106 107 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) 108 109 static void __init setup_bootmem(void) 110 { 111 unsigned long bootmap_size; 112 unsigned long mem_max; 113 unsigned long bootmap_pages; 114 unsigned long bootmap_start_pfn; 115 unsigned long bootmap_pfn; 116 #ifndef CONFIG_DISCONTIGMEM 117 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; 118 int npmem_holes; 119 #endif 120 int i, sysram_resource_count; 121 122 disable_sr_hashing(); /* Turn off space register hashing */ 123 124 /* 125 * Sort the ranges. Since the number of ranges is typically 126 * small, and performance is not an issue here, just do 127 * a simple insertion sort. 128 */ 129 130 for (i = 1; i < npmem_ranges; i++) { 131 int j; 132 133 for (j = i; j > 0; j--) { 134 unsigned long tmp; 135 136 if (pmem_ranges[j-1].start_pfn < 137 pmem_ranges[j].start_pfn) { 138 139 break; 140 } 141 tmp = pmem_ranges[j-1].start_pfn; 142 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; 143 pmem_ranges[j].start_pfn = tmp; 144 tmp = pmem_ranges[j-1].pages; 145 pmem_ranges[j-1].pages = pmem_ranges[j].pages; 146 pmem_ranges[j].pages = tmp; 147 } 148 } 149 150 #ifndef CONFIG_DISCONTIGMEM 151 /* 152 * Throw out ranges that are too far apart (controlled by 153 * MAX_GAP). 154 */ 155 156 for (i = 1; i < npmem_ranges; i++) { 157 if (pmem_ranges[i].start_pfn - 158 (pmem_ranges[i-1].start_pfn + 159 pmem_ranges[i-1].pages) > MAX_GAP) { 160 npmem_ranges = i; 161 printk("Large gap in memory detected (%ld pages). " 162 "Consider turning on CONFIG_DISCONTIGMEM\n", 163 pmem_ranges[i].start_pfn - 164 (pmem_ranges[i-1].start_pfn + 165 pmem_ranges[i-1].pages)); 166 break; 167 } 168 } 169 #endif 170 171 if (npmem_ranges > 1) { 172 173 /* Print the memory ranges */ 174 175 printk(KERN_INFO "Memory Ranges:\n"); 176 177 for (i = 0; i < npmem_ranges; i++) { 178 unsigned long start; 179 unsigned long size; 180 181 size = (pmem_ranges[i].pages << PAGE_SHIFT); 182 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); 183 printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", 184 i,start, start + (size - 1), size >> 20); 185 } 186 } 187 188 sysram_resource_count = npmem_ranges; 189 for (i = 0; i < sysram_resource_count; i++) { 190 struct resource *res = &sysram_resources[i]; 191 res->name = "System RAM"; 192 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; 193 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; 194 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 195 request_resource(&iomem_resource, res); 196 } 197 198 /* 199 * For 32 bit kernels we limit the amount of memory we can 200 * support, in order to preserve enough kernel address space 201 * for other purposes. For 64 bit kernels we don't normally 202 * limit the memory, but this mechanism can be used to 203 * artificially limit the amount of memory (and it is written 204 * to work with multiple memory ranges). 205 */ 206 207 mem_limit_func(); /* check for "mem=" argument */ 208 209 mem_max = 0; 210 num_physpages = 0; 211 for (i = 0; i < npmem_ranges; i++) { 212 unsigned long rsize; 213 214 rsize = pmem_ranges[i].pages << PAGE_SHIFT; 215 if ((mem_max + rsize) > mem_limit) { 216 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); 217 if (mem_max == mem_limit) 218 npmem_ranges = i; 219 else { 220 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) 221 - (mem_max >> PAGE_SHIFT); 222 npmem_ranges = i + 1; 223 mem_max = mem_limit; 224 } 225 num_physpages += pmem_ranges[i].pages; 226 break; 227 } 228 num_physpages += pmem_ranges[i].pages; 229 mem_max += rsize; 230 } 231 232 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); 233 234 #ifndef CONFIG_DISCONTIGMEM 235 /* Merge the ranges, keeping track of the holes */ 236 237 { 238 unsigned long end_pfn; 239 unsigned long hole_pages; 240 241 npmem_holes = 0; 242 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; 243 for (i = 1; i < npmem_ranges; i++) { 244 245 hole_pages = pmem_ranges[i].start_pfn - end_pfn; 246 if (hole_pages) { 247 pmem_holes[npmem_holes].start_pfn = end_pfn; 248 pmem_holes[npmem_holes++].pages = hole_pages; 249 end_pfn += hole_pages; 250 } 251 end_pfn += pmem_ranges[i].pages; 252 } 253 254 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; 255 npmem_ranges = 1; 256 } 257 #endif 258 259 bootmap_pages = 0; 260 for (i = 0; i < npmem_ranges; i++) 261 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); 262 263 bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; 264 265 #ifdef CONFIG_DISCONTIGMEM 266 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { 267 memset(NODE_DATA(i), 0, sizeof(pg_data_t)); 268 NODE_DATA(i)->bdata = &bmem_data[i]; 269 } 270 memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); 271 272 for (i = 0; i < npmem_ranges; i++) 273 node_set_online(i); 274 #endif 275 276 /* 277 * Initialize and free the full range of memory in each range. 278 * Note that the only writing these routines do are to the bootmap, 279 * and we've made sure to locate the bootmap properly so that they 280 * won't be writing over anything important. 281 */ 282 283 bootmap_pfn = bootmap_start_pfn; 284 max_pfn = 0; 285 for (i = 0; i < npmem_ranges; i++) { 286 unsigned long start_pfn; 287 unsigned long npages; 288 289 start_pfn = pmem_ranges[i].start_pfn; 290 npages = pmem_ranges[i].pages; 291 292 bootmap_size = init_bootmem_node(NODE_DATA(i), 293 bootmap_pfn, 294 start_pfn, 295 (start_pfn + npages) ); 296 free_bootmem_node(NODE_DATA(i), 297 (start_pfn << PAGE_SHIFT), 298 (npages << PAGE_SHIFT) ); 299 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; 300 if ((start_pfn + npages) > max_pfn) 301 max_pfn = start_pfn + npages; 302 } 303 304 /* IOMMU is always used to access "high mem" on those boxes 305 * that can support enough mem that a PCI device couldn't 306 * directly DMA to any physical addresses. 307 * ISA DMA support will need to revisit this. 308 */ 309 max_low_pfn = max_pfn; 310 311 if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) { 312 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n"); 313 BUG(); 314 } 315 316 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ 317 318 #define PDC_CONSOLE_IO_IODC_SIZE 32768 319 320 reserve_bootmem_node(NODE_DATA(0), 0UL, 321 (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE)); 322 reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text), 323 (unsigned long)(&_end - &_text)); 324 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), 325 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT)); 326 327 #ifndef CONFIG_DISCONTIGMEM 328 329 /* reserve the holes */ 330 331 for (i = 0; i < npmem_holes; i++) { 332 reserve_bootmem_node(NODE_DATA(0), 333 (pmem_holes[i].start_pfn << PAGE_SHIFT), 334 (pmem_holes[i].pages << PAGE_SHIFT)); 335 } 336 #endif 337 338 #ifdef CONFIG_BLK_DEV_INITRD 339 if (initrd_start) { 340 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); 341 if (__pa(initrd_start) < mem_max) { 342 unsigned long initrd_reserve; 343 344 if (__pa(initrd_end) > mem_max) { 345 initrd_reserve = mem_max - __pa(initrd_start); 346 } else { 347 initrd_reserve = initrd_end - initrd_start; 348 } 349 initrd_below_start_ok = 1; 350 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); 351 352 reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve); 353 } 354 } 355 #endif 356 357 data_resource.start = virt_to_phys(&data_start); 358 data_resource.end = virt_to_phys(&_end)-1; 359 code_resource.start = virt_to_phys(&_text); 360 code_resource.end = virt_to_phys(&data_start)-1; 361 362 /* We don't know which region the kernel will be in, so try 363 * all of them. 364 */ 365 for (i = 0; i < sysram_resource_count; i++) { 366 struct resource *res = &sysram_resources[i]; 367 request_resource(res, &code_resource); 368 request_resource(res, &data_resource); 369 } 370 request_resource(&sysram_resources[0], &pdcdata_resource); 371 } 372 373 void free_initmem(void) 374 { 375 unsigned long addr, init_begin, init_end; 376 377 printk(KERN_INFO "Freeing unused kernel memory: "); 378 379 #ifdef CONFIG_DEBUG_KERNEL 380 /* Attempt to catch anyone trying to execute code here 381 * by filling the page with BRK insns. 382 * 383 * If we disable interrupts for all CPUs, then IPI stops working. 384 * Kinda breaks the global cache flushing. 385 */ 386 local_irq_disable(); 387 388 memset(&__init_begin, 0x00, 389 (unsigned long)&__init_end - (unsigned long)&__init_begin); 390 391 flush_data_cache(); 392 asm volatile("sync" : : ); 393 flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end); 394 asm volatile("sync" : : ); 395 396 local_irq_enable(); 397 #endif 398 399 /* align __init_begin and __init_end to page size, 400 ignoring linker script where we might have tried to save RAM */ 401 init_begin = PAGE_ALIGN((unsigned long)(&__init_begin)); 402 init_end = PAGE_ALIGN((unsigned long)(&__init_end)); 403 for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) { 404 ClearPageReserved(virt_to_page(addr)); 405 init_page_count(virt_to_page(addr)); 406 free_page(addr); 407 num_physpages++; 408 totalram_pages++; 409 } 410 411 /* set up a new led state on systems shipped LED State panel */ 412 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); 413 414 printk("%luk freed\n", (init_end - init_begin) >> 10); 415 } 416 417 418 #ifdef CONFIG_DEBUG_RODATA 419 void mark_rodata_ro(void) 420 { 421 /* rodata memory was already mapped with KERNEL_RO access rights by 422 pagetable_init() and map_pages(). No need to do additional stuff here */ 423 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", 424 (unsigned long)(__end_rodata - __start_rodata) >> 10); 425 } 426 #endif 427 428 429 /* 430 * Just an arbitrary offset to serve as a "hole" between mapping areas 431 * (between top of physical memory and a potential pcxl dma mapping 432 * area, and below the vmalloc mapping area). 433 * 434 * The current 32K value just means that there will be a 32K "hole" 435 * between mapping areas. That means that any out-of-bounds memory 436 * accesses will hopefully be caught. The vmalloc() routines leaves 437 * a hole of 4kB between each vmalloced area for the same reason. 438 */ 439 440 /* Leave room for gateway page expansion */ 441 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE 442 #error KERNEL_MAP_START is in gateway reserved region 443 #endif 444 #define MAP_START (KERNEL_MAP_START) 445 446 #define VM_MAP_OFFSET (32*1024) 447 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ 448 & ~(VM_MAP_OFFSET-1))) 449 450 void *vmalloc_start __read_mostly; 451 EXPORT_SYMBOL(vmalloc_start); 452 453 #ifdef CONFIG_PA11 454 unsigned long pcxl_dma_start __read_mostly; 455 #endif 456 457 void __init mem_init(void) 458 { 459 high_memory = __va((max_pfn << PAGE_SHIFT)); 460 461 #ifndef CONFIG_DISCONTIGMEM 462 max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; 463 totalram_pages += free_all_bootmem(); 464 #else 465 { 466 int i; 467 468 for (i = 0; i < npmem_ranges; i++) 469 totalram_pages += free_all_bootmem_node(NODE_DATA(i)); 470 } 471 #endif 472 473 printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10)); 474 475 #ifdef CONFIG_PA11 476 if (hppa_dma_ops == &pcxl_dma_ops) { 477 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); 478 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE); 479 } else { 480 pcxl_dma_start = 0; 481 vmalloc_start = SET_MAP_OFFSET(MAP_START); 482 } 483 #else 484 vmalloc_start = SET_MAP_OFFSET(MAP_START); 485 #endif 486 487 } 488 489 unsigned long *empty_zero_page __read_mostly; 490 491 void show_mem(void) 492 { 493 int i,free = 0,total = 0,reserved = 0; 494 int shared = 0, cached = 0; 495 496 printk(KERN_INFO "Mem-info:\n"); 497 show_free_areas(); 498 printk(KERN_INFO "Free swap: %6ldkB\n", 499 nr_swap_pages<<(PAGE_SHIFT-10)); 500 #ifndef CONFIG_DISCONTIGMEM 501 i = max_mapnr; 502 while (i-- > 0) { 503 total++; 504 if (PageReserved(mem_map+i)) 505 reserved++; 506 else if (PageSwapCache(mem_map+i)) 507 cached++; 508 else if (!page_count(&mem_map[i])) 509 free++; 510 else 511 shared += page_count(&mem_map[i]) - 1; 512 } 513 #else 514 for (i = 0; i < npmem_ranges; i++) { 515 int j; 516 517 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { 518 struct page *p; 519 unsigned long flags; 520 521 pgdat_resize_lock(NODE_DATA(i), &flags); 522 p = nid_page_nr(i, j) - node_start_pfn(i); 523 524 total++; 525 if (PageReserved(p)) 526 reserved++; 527 else if (PageSwapCache(p)) 528 cached++; 529 else if (!page_count(p)) 530 free++; 531 else 532 shared += page_count(p) - 1; 533 pgdat_resize_unlock(NODE_DATA(i), &flags); 534 } 535 } 536 #endif 537 printk(KERN_INFO "%d pages of RAM\n", total); 538 printk(KERN_INFO "%d reserved pages\n", reserved); 539 printk(KERN_INFO "%d pages shared\n", shared); 540 printk(KERN_INFO "%d pages swap cached\n", cached); 541 542 543 #ifdef CONFIG_DISCONTIGMEM 544 { 545 struct zonelist *zl; 546 int i, j, k; 547 548 for (i = 0; i < npmem_ranges; i++) { 549 for (j = 0; j < MAX_NR_ZONES; j++) { 550 zl = NODE_DATA(i)->node_zonelists + j; 551 552 printk("Zone list for zone %d on node %d: ", j, i); 553 for (k = 0; zl->zones[k] != NULL; k++) 554 printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name); 555 printk("\n"); 556 } 557 } 558 } 559 #endif 560 } 561 562 563 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot) 564 { 565 pgd_t *pg_dir; 566 pmd_t *pmd; 567 pte_t *pg_table; 568 unsigned long end_paddr; 569 unsigned long start_pmd; 570 unsigned long start_pte; 571 unsigned long tmp1; 572 unsigned long tmp2; 573 unsigned long address; 574 unsigned long ro_start; 575 unsigned long ro_end; 576 unsigned long fv_addr; 577 unsigned long gw_addr; 578 extern const unsigned long fault_vector_20; 579 extern void * const linux_gateway_page; 580 581 ro_start = __pa((unsigned long)&_text); 582 ro_end = __pa((unsigned long)&data_start); 583 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; 584 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; 585 586 end_paddr = start_paddr + size; 587 588 pg_dir = pgd_offset_k(start_vaddr); 589 590 #if PTRS_PER_PMD == 1 591 start_pmd = 0; 592 #else 593 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 594 #endif 595 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 596 597 address = start_paddr; 598 while (address < end_paddr) { 599 #if PTRS_PER_PMD == 1 600 pmd = (pmd_t *)__pa(pg_dir); 601 #else 602 pmd = (pmd_t *)pgd_address(*pg_dir); 603 604 /* 605 * pmd is physical at this point 606 */ 607 608 if (!pmd) { 609 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER); 610 pmd = (pmd_t *) __pa(pmd); 611 } 612 613 pgd_populate(NULL, pg_dir, __va(pmd)); 614 #endif 615 pg_dir++; 616 617 /* now change pmd to kernel virtual addresses */ 618 619 pmd = (pmd_t *)__va(pmd) + start_pmd; 620 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) { 621 622 /* 623 * pg_table is physical at this point 624 */ 625 626 pg_table = (pte_t *)pmd_address(*pmd); 627 if (!pg_table) { 628 pg_table = (pte_t *) 629 alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE); 630 pg_table = (pte_t *) __pa(pg_table); 631 } 632 633 pmd_populate_kernel(NULL, pmd, __va(pg_table)); 634 635 /* now change pg_table to kernel virtual addresses */ 636 637 pg_table = (pte_t *) __va(pg_table) + start_pte; 638 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) { 639 pte_t pte; 640 641 /* 642 * Map the fault vector writable so we can 643 * write the HPMC checksum. 644 */ 645 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 646 if (address >= ro_start && address < ro_end 647 && address != fv_addr 648 && address != gw_addr) 649 pte = __mk_pte(address, PAGE_KERNEL_RO); 650 else 651 #endif 652 pte = __mk_pte(address, pgprot); 653 654 if (address >= end_paddr) 655 pte_val(pte) = 0; 656 657 set_pte(pg_table, pte); 658 659 address += PAGE_SIZE; 660 } 661 start_pte = 0; 662 663 if (address >= end_paddr) 664 break; 665 } 666 start_pmd = 0; 667 } 668 } 669 670 /* 671 * pagetable_init() sets up the page tables 672 * 673 * Note that gateway_init() places the Linux gateway page at page 0. 674 * Since gateway pages cannot be dereferenced this has the desirable 675 * side effect of trapping those pesky NULL-reference errors in the 676 * kernel. 677 */ 678 static void __init pagetable_init(void) 679 { 680 int range; 681 682 /* Map each physical memory range to its kernel vaddr */ 683 684 for (range = 0; range < npmem_ranges; range++) { 685 unsigned long start_paddr; 686 unsigned long end_paddr; 687 unsigned long size; 688 689 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; 690 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); 691 size = pmem_ranges[range].pages << PAGE_SHIFT; 692 693 map_pages((unsigned long)__va(start_paddr), start_paddr, 694 size, PAGE_KERNEL); 695 } 696 697 #ifdef CONFIG_BLK_DEV_INITRD 698 if (initrd_end && initrd_end > mem_limit) { 699 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); 700 map_pages(initrd_start, __pa(initrd_start), 701 initrd_end - initrd_start, PAGE_KERNEL); 702 } 703 #endif 704 705 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); 706 memset(empty_zero_page, 0, PAGE_SIZE); 707 } 708 709 static void __init gateway_init(void) 710 { 711 unsigned long linux_gateway_page_addr; 712 /* FIXME: This is 'const' in order to trick the compiler 713 into not treating it as DP-relative data. */ 714 extern void * const linux_gateway_page; 715 716 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; 717 718 /* 719 * Setup Linux Gateway page. 720 * 721 * The Linux gateway page will reside in kernel space (on virtual 722 * page 0), so it doesn't need to be aliased into user space. 723 */ 724 725 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), 726 PAGE_SIZE, PAGE_GATEWAY); 727 } 728 729 #ifdef CONFIG_HPUX 730 void 731 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) 732 { 733 pgd_t *pg_dir; 734 pmd_t *pmd; 735 pte_t *pg_table; 736 unsigned long start_pmd; 737 unsigned long start_pte; 738 unsigned long address; 739 unsigned long hpux_gw_page_addr; 740 /* FIXME: This is 'const' in order to trick the compiler 741 into not treating it as DP-relative data. */ 742 extern void * const hpux_gateway_page; 743 744 hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; 745 746 /* 747 * Setup HP-UX Gateway page. 748 * 749 * The HP-UX gateway page resides in the user address space, 750 * so it needs to be aliased into each process. 751 */ 752 753 pg_dir = pgd_offset(mm,hpux_gw_page_addr); 754 755 #if PTRS_PER_PMD == 1 756 start_pmd = 0; 757 #else 758 start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 759 #endif 760 start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 761 762 address = __pa(&hpux_gateway_page); 763 #if PTRS_PER_PMD == 1 764 pmd = (pmd_t *)__pa(pg_dir); 765 #else 766 pmd = (pmd_t *) pgd_address(*pg_dir); 767 768 /* 769 * pmd is physical at this point 770 */ 771 772 if (!pmd) { 773 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); 774 pmd = (pmd_t *) __pa(pmd); 775 } 776 777 __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); 778 #endif 779 /* now change pmd to kernel virtual addresses */ 780 781 pmd = (pmd_t *)__va(pmd) + start_pmd; 782 783 /* 784 * pg_table is physical at this point 785 */ 786 787 pg_table = (pte_t *) pmd_address(*pmd); 788 if (!pg_table) 789 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); 790 791 __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); 792 793 /* now change pg_table to kernel virtual addresses */ 794 795 pg_table = (pte_t *) __va(pg_table) + start_pte; 796 set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); 797 } 798 EXPORT_SYMBOL(map_hpux_gateway_page); 799 #endif 800 801 void __init paging_init(void) 802 { 803 int i; 804 805 setup_bootmem(); 806 pagetable_init(); 807 gateway_init(); 808 flush_cache_all_local(); /* start with known state */ 809 flush_tlb_all_local(NULL); 810 811 for (i = 0; i < npmem_ranges; i++) { 812 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 }; 813 814 /* We have an IOMMU, so all memory can go into a single 815 ZONE_DMA zone. */ 816 zones_size[ZONE_DMA] = pmem_ranges[i].pages; 817 818 #ifdef CONFIG_DISCONTIGMEM 819 /* Need to initialize the pfnnid_map before we can initialize 820 the zone */ 821 { 822 int j; 823 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); 824 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); 825 j++) { 826 pfnnid_map[j] = i; 827 } 828 } 829 #endif 830 831 free_area_init_node(i, NODE_DATA(i), zones_size, 832 pmem_ranges[i].start_pfn, NULL); 833 } 834 } 835 836 #ifdef CONFIG_PA20 837 838 /* 839 * Currently, all PA20 chips have 18 bit protection id's, which is the 840 * limiting factor (space ids are 32 bits). 841 */ 842 843 #define NR_SPACE_IDS 262144 844 845 #else 846 847 /* 848 * Currently we have a one-to-one relationship between space id's and 849 * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only 850 * support 15 bit protection id's, so that is the limiting factor. 851 * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's 852 * probably not worth the effort for a special case here. 853 */ 854 855 #define NR_SPACE_IDS 32768 856 857 #endif /* !CONFIG_PA20 */ 858 859 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) 860 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) 861 862 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ 863 static unsigned long dirty_space_id[SID_ARRAY_SIZE]; 864 static unsigned long space_id_index; 865 static unsigned long free_space_ids = NR_SPACE_IDS - 1; 866 static unsigned long dirty_space_ids = 0; 867 868 static DEFINE_SPINLOCK(sid_lock); 869 870 unsigned long alloc_sid(void) 871 { 872 unsigned long index; 873 874 spin_lock(&sid_lock); 875 876 if (free_space_ids == 0) { 877 if (dirty_space_ids != 0) { 878 spin_unlock(&sid_lock); 879 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ 880 spin_lock(&sid_lock); 881 } 882 BUG_ON(free_space_ids == 0); 883 } 884 885 free_space_ids--; 886 887 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); 888 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); 889 space_id_index = index; 890 891 spin_unlock(&sid_lock); 892 893 return index << SPACEID_SHIFT; 894 } 895 896 void free_sid(unsigned long spaceid) 897 { 898 unsigned long index = spaceid >> SPACEID_SHIFT; 899 unsigned long *dirty_space_offset; 900 901 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); 902 index &= (BITS_PER_LONG - 1); 903 904 spin_lock(&sid_lock); 905 906 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ 907 908 *dirty_space_offset |= (1L << index); 909 dirty_space_ids++; 910 911 spin_unlock(&sid_lock); 912 } 913 914 915 #ifdef CONFIG_SMP 916 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) 917 { 918 int i; 919 920 /* NOTE: sid_lock must be held upon entry */ 921 922 *ndirtyptr = dirty_space_ids; 923 if (dirty_space_ids != 0) { 924 for (i = 0; i < SID_ARRAY_SIZE; i++) { 925 dirty_array[i] = dirty_space_id[i]; 926 dirty_space_id[i] = 0; 927 } 928 dirty_space_ids = 0; 929 } 930 931 return; 932 } 933 934 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) 935 { 936 int i; 937 938 /* NOTE: sid_lock must be held upon entry */ 939 940 if (ndirty != 0) { 941 for (i = 0; i < SID_ARRAY_SIZE; i++) { 942 space_id[i] ^= dirty_array[i]; 943 } 944 945 free_space_ids += ndirty; 946 space_id_index = 0; 947 } 948 } 949 950 #else /* CONFIG_SMP */ 951 952 static void recycle_sids(void) 953 { 954 int i; 955 956 /* NOTE: sid_lock must be held upon entry */ 957 958 if (dirty_space_ids != 0) { 959 for (i = 0; i < SID_ARRAY_SIZE; i++) { 960 space_id[i] ^= dirty_space_id[i]; 961 dirty_space_id[i] = 0; 962 } 963 964 free_space_ids += dirty_space_ids; 965 dirty_space_ids = 0; 966 space_id_index = 0; 967 } 968 } 969 #endif 970 971 /* 972 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is 973 * purged, we can safely reuse the space ids that were released but 974 * not flushed from the tlb. 975 */ 976 977 #ifdef CONFIG_SMP 978 979 static unsigned long recycle_ndirty; 980 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; 981 static unsigned int recycle_inuse; 982 983 void flush_tlb_all(void) 984 { 985 int do_recycle; 986 987 do_recycle = 0; 988 spin_lock(&sid_lock); 989 if (dirty_space_ids > RECYCLE_THRESHOLD) { 990 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ 991 get_dirty_sids(&recycle_ndirty,recycle_dirty_array); 992 recycle_inuse++; 993 do_recycle++; 994 } 995 spin_unlock(&sid_lock); 996 on_each_cpu(flush_tlb_all_local, NULL, 1, 1); 997 if (do_recycle) { 998 spin_lock(&sid_lock); 999 recycle_sids(recycle_ndirty,recycle_dirty_array); 1000 recycle_inuse = 0; 1001 spin_unlock(&sid_lock); 1002 } 1003 } 1004 #else 1005 void flush_tlb_all(void) 1006 { 1007 spin_lock(&sid_lock); 1008 flush_tlb_all_local(NULL); 1009 recycle_sids(); 1010 spin_unlock(&sid_lock); 1011 } 1012 #endif 1013 1014 #ifdef CONFIG_BLK_DEV_INITRD 1015 void free_initrd_mem(unsigned long start, unsigned long end) 1016 { 1017 if (start >= end) 1018 return; 1019 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 1020 for (; start < end; start += PAGE_SIZE) { 1021 ClearPageReserved(virt_to_page(start)); 1022 init_page_count(virt_to_page(start)); 1023 free_page(start); 1024 num_physpages++; 1025 totalram_pages++; 1026 } 1027 } 1028 #endif 1029